Terrestrial climate signal of the "8200-yr cold event" in the Labrador Sea region
Terrestrial climate signal of the "8200-yr cold event" in the Labrador Sea region
Accelerated melting of Greenland ice has raised concern about the future impact of enhanced freshwater discharge on regional climate through its effect on ocean circulation. An abrupt cooling event ca. 8200 cal. yr B.P. has been linked to meltwater from the decaying North American ice sheet. Oxygen isotopic analyses of cellulose from subfossil Sphagnum mosses, isolated from a Newfoundland peat core, reveal a pronounced anomaly ca. 8350 yr B.P. with a duration of ~150 years. The maximum estimated ?18Oprecipitation change, 4.53‰ ± 1.05‰ (Vienna Standard Mean Ocean Water), is the largest observed in the circum-North Atlantic region. The magnitude of change exceeds that predicted by recent paleoclimate simulations. Comparisons with recent records of surface and deep ocean proxies in the Labrador Sea and the wider North Atlantic region suggest synchroneity. However, an ~200 year delay between the responses of the Labrador Sea region and the Greenland Ice Sheet to the effects of meltwater release remains to be explained.
831-834
Daley, T.J.
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Street-Perrott, F.A.
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Loader, N.J.
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Barber, K.E.
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Hughes, P.D.M.
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Fisher, E.H.
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Marshall, J.D.
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September 2009
Daley, T.J.
5c28d905-5593-4cf6-85fc-c0e9a05ae512
Street-Perrott, F.A.
d688663d-04e2-45a8-b856-180a8ea32412
Loader, N.J.
c49f7361-2c8c-4fe2-abbf-a6d087c51ae8
Barber, K.E.
83d1acae-326d-4cb5-94b6-3d1dc78d64e9
Hughes, P.D.M.
14f83168-b203-4a91-a850-8c48535dc31b
Fisher, E.H.
6db25198-bf2e-4dc8-807f-7729b124969e
Marshall, J.D.
cb50a946-8912-4499-96c3-5123c48152b8
Daley, T.J., Street-Perrott, F.A., Loader, N.J., Barber, K.E., Hughes, P.D.M., Fisher, E.H. and Marshall, J.D.
(2009)
Terrestrial climate signal of the "8200-yr cold event" in the Labrador Sea region.
Geology, 37 (9), .
(doi:10.1130/G30043A.1).
Abstract
Accelerated melting of Greenland ice has raised concern about the future impact of enhanced freshwater discharge on regional climate through its effect on ocean circulation. An abrupt cooling event ca. 8200 cal. yr B.P. has been linked to meltwater from the decaying North American ice sheet. Oxygen isotopic analyses of cellulose from subfossil Sphagnum mosses, isolated from a Newfoundland peat core, reveal a pronounced anomaly ca. 8350 yr B.P. with a duration of ~150 years. The maximum estimated ?18Oprecipitation change, 4.53‰ ± 1.05‰ (Vienna Standard Mean Ocean Water), is the largest observed in the circum-North Atlantic region. The magnitude of change exceeds that predicted by recent paleoclimate simulations. Comparisons with recent records of surface and deep ocean proxies in the Labrador Sea and the wider North Atlantic region suggest synchroneity. However, an ~200 year delay between the responses of the Labrador Sea region and the Greenland Ice Sheet to the effects of meltwater release remains to be explained.
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Published date: September 2009
Organisations:
Environmental Processes & Change
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Local EPrints ID: 66832
URI: http://eprints.soton.ac.uk/id/eprint/66832
ISSN: 0091-7613
PURE UUID: 767457c9-90d4-41ab-901c-ff8af31c433a
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Date deposited: 28 Jul 2009
Last modified: 14 Mar 2024 02:42
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Author:
T.J. Daley
Author:
F.A. Street-Perrott
Author:
N.J. Loader
Author:
K.E. Barber
Author:
E.H. Fisher
Author:
J.D. Marshall
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